[AmberV]

While there is certainly a top-level distinction between the two, is not this how it already basically works? You can set a default context to tasks with sub-tasks, which its children will inherit, and you can set whether or not it is a parallel or sequential sub-project. And if I have a task that needs to be a full blown project, I can just drag it over to the shelf and it becomes one. If a project needs to be a task, I drag it out of the shelf into another project, and it becomes a task (with sub-tasks, if any exist). I don't know, this seems awfully flexible to me, and it helps keep things tidy.